Zebra Technologies WPT 3400 Users manual
User Guide
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User Guide, WherePort IV
Document Number D1300
Document Revision History
Revision Description of Change Date Approved
A Release per ECO C01554 08/12/08 D. Olsen
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User Guide, WherePort IV D1300 REV A
© Copyright WhereNet, Corp. 2008 WhereNet Confidential
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ABLE OF CONTENTS
1.0 SCOPE 6
2.0 NOTICES AND REQUIREMENTS 6
2.1. FCC AND IC REQUIREMENTS 6
2.2. EUROPE R&TTE DIRECTIVE 1999/5/EC REQUIREMENTS 6
2.3. RF NOTICE 6
3.0 APPLICABLE DOCUMENTS 7
4.0 EQUIPMENT AND ACCESSORIES 7
5.0 SYSTEM OVERVIEW 7
5.1. THIS GUIDE 9
5.2. THE WHEREPORT IV 9
5.3. HEALTH TAG 10
5.4. WHEREPORT IV MOUNTING 10
6.0 THE WHERETAG 11
6.1. WHERETAG RESPONSES 12
6.2. USING THE WHEREPORT IV ID 14
7.0 MAGNETIC COMMUNICATION BASICS 16
7.1. M
AGNETIC FIELDS 16
7.2. COVERAGE AREAS 18
7.3. P
7.4. C
OWER LEVEL 19
OVERAGE OVERLAPS 21
7.5. PHASES 21
7.6. SEQUENCING 22
7.7. D
UAL WHEREPORT IVS 24
7.8. INTERFERENCE 25
7.9. THE FIELD METER 26
7.10. T
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7.11. CAPTURE AREA SIMULATOR 27
8.0 WHEREPORT IV IN THE FIELD 28
8.1. ZONES 28
8.2. AREA COVERAGE 29
8.3. PORTALS 29
8.4. MULTI-FLOOR INSTALLATIONS 32
8.5. LOCKED WHEREPORT IVS 32
8.6. MULTIPLE WHEREPORT IVS 33
8.7. SEQUENCED WHEREPORT IVS 37
8.8. SUMMARY 37
9.0 WORKING THRU AN APPLICATION 38
9.1. WAREHOUSE AND SHIPPING FACILITY 39
9.2. POSITIONING THE WHEREPORT IVS 41
10.0 USING THE SIMULATOR 42
10.1. SIMULATOR CONTROLS AND FEATURES 42
10.2. WHEREPORT IV CONFIGURATION 43
10.3. SAMPLE GRAPHS 46
10.4. ADJACENT WHEREPORT IVS 49
11.0 GLOSSARY 50
12.0 COMMAND SUMMARY 52
12.1. INITIAL POWER UP 52
12.2. P
ASSWORDS 52
12.3. COMMAND EXECUTION 53
12.4. T
AG RESPONSES TO COMMANDS 53
12.5. COMMANDS 54
12.5.1. M
ESSAGE LENGTH 54
12.5.2. POWER 54
12.5.3. P
HASE 55
12.5.4. W
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12.5.5. TAG ID 56
12.5.6. RESPONSE 56
12.5.7. COUNT 56
12.5.8. INTERVAL 57
12.5.9. TRIGGER 57
12.5.10. DATA 57
12.5.11. EXE 58
12.5.12. SEQUENCE MODE 58
12.5.13. SEQUENCE MODE MESSAGE NUMBER 58
12.5.14. VERSION 59
12.5.15. XPW 59
12.5.16. HWT (1) 59
12.5.17. LOADER 59
12.5.18. GQ 59
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List of Figures
Figure 1 WherePort IV............................................................................................................................8
Figure 2 Wiring Schematic for Power and Synchronization.................................................................10
Figure 3 WherePort IV Mounting Bracket............................................................................................11
Figure 4 Orientation ..............................................................................................................................17
Figure 5 Capture Area ...........................................................................................................................17
Figure 6 Orientation and Capture Area .................................................................................................19
Figure 7 Overlapping Uncertainty Areas ..............................................................................................21
Figure 8 Phase and WherePort IV Orientation......................................................................................22
Figure 9 Mode 1 ....................................................................................................................................23
Figure 10 Mode 2 ................................................................................................................................23
Figure 11 Mode 3 ................................................................................................................................24
Figure 12 Dual Where Port .................................................................................................................24
Figure 13 Magnetic Field Meter..........................................................................................................26
Figure 14 WherePort IV Coverage..........................................................................................................28
Figure 15 WherePort IV in a Doorway ...................................................................................................30
Figure 16 Loading Dock Doors...............................................................................................................31
Figure 17 Multi-Floor Schematic............................................................................................................32
Figure 18 Phasing for Wall Mounted WherePort IVs.............................................................................34
Figure 19 Phasing for Ceiling and Wall WherePort IVs.........................................................................35
Figure 20 Loading Dock Door Options...................................................................................................35
Figure 21 Over the Door WherePort IV Mounting .................................................................................36
Figure 22 The Warehouse Site ................................................................................................................38
Figure 23 WherePort IVs Mounted on the Site.......................................................................................40
Figure 24 Starting the WherePort IV Simulator......................................................................................42
Figure 25 Configuration Screen ..............................................................................................................43
Figure 26 Tag Orientations for the Graphs .............................................................................................44
Figure 27 Sample Graph..........................................................................................................................45
Figure 28 Sample Graph..........................................................................................................................46
Figure 29 Power Level Comparison Tag Orientation 2 ..........................................................................47
Figure 30 Power Level Comparison Tag Orientation 6 ..........................................................................48
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1.0 SCOPE
To provide a RTLS system overview and give some magnetic communication background information
relevant to the WherePort IV function. This guide shows the application of a WherePort IV device in the
field in association with tags and shows an application example and also shows the use of a simulator
tool to analyze the field pattern. The command summary is also reviewed.
2.0 NOTICES AND REQUIREMENTS
Proper safety procedures shall be taken for cabling connections, including powering the WherePort IV
using a POE cable or using an AC adapter.
2.1. FCC and IC Requirements
This device must operate in compliance with Federal Communications Commission (FCC) Rules and
Regulations Part 15.207, and 15.209 and IC Regulations RSS210. See FCC and IC registrations on label,
located on the bottom of the equipment for the FCC registration.
This equipment has been tested and found to comply with the limits of Class A devices pursuant to Part
15 of the FCC Rules and to RSS210 of Industry Canada. Operation is subject to the following two
conditions: First, the device may not cause harmful interference. Second, this device must accept any
interference which may cause undesired operation.
2.2. Europe R&TTE Directive 1999/5/EC Requirements
This device must operate in compliance with EN 301489-3, and EN 300 330-1/-2. The device complies
with an assessment for a TCF compilation for EMC, Radio, and Safety including IEC/EN 60950-1:2006.
See CE mark and safety agency registrations on label, located on bottom of the equipment.
This equipment has been tested and found to comply with the limits of Class 2 products (frequency band
not harmonized in EU) for the following countries: Austria, Belgium, Bulgaria, Denmark, Estonia,
Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lichtenstein, Lithuania,
Luxemburg, Netherlands, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland
and UK.
2.3. RF Notice
Any changes or modifications to WhereNet – a Zebra Company equipment not expressly approved by
WhereNet Corporation could void the user’s authority to operate the equipment.
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3.0 APPLICABLE DOCUMENTS
The following documents, latest revision, form a part of this document to the extent specified herein. In
the event of conflict the documents listed below shall govern.
• WPT-3400 WherePort IV
• 24827 Instruction Sheet, WherePort IV, Installation
• D1297 Outline Drawing, WherePort IV
4.0 EQUIPMENT AND ACCESSORIES
• 24830 WherePort IV, Remote Tag Exciter
• 25040 Bracket, Mounting, WherePort IV
• 25379 48VDC Power Adapter for US, C13
• 23820 AC Power Cord for Continental Europe, IEC 320, C13
5.0 SYSTEM OVERVIEW
The WherePort IV is a location indicator that is part of the Real Time Locating System (Figure 1). The
WherePort IV transmits a localized magnetic field. Since the field is confined (programmable from
approximately 3 feet to 20 feet) it is a reliable indicator of the location of key sites in the facility. When
WhereTags pass through the WherePort IV field they transmit the ID of the WherePort IV. The
WhereTag response can be programmed to indicate needed information about the status of the asset or
object to which the tag is attached.
WherePort IVs are mounted to fixed locations such as gates, loading docks, or cells along an assembly
line so that information required about the movement of assets through the facility will be gathered by
the RTLS. As tagged assets pass through the fields the tag transmits the WherePort IV ID that pinged it
and any other programmed status information.
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Status LED
Figure 1 WherePort IV
The VSS system is programmed with the location of each WherePort IV and their ID. When a WhereTag
transmits a message that includes the ID of the WherePort IV field that it is in, the system knows where
the WhereTag is. This is particularly important when locating transitions is important or where the layout
of the site makes it difficult to have enough sensors to accurately locate the tag using RTLS.
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5.1. This Guide
This guide presents the basic principles of WherePort IV communication and the major issues for placing
them on a site. It is intended to support both the planning for and the implementation of an RTLS
application using WherePort IVs.
It describes the WherePort IV, the WhereTag and its responses, the characteristics of the magnetic field,
and how the WherePort IV is used in a variety of applications. For more detailed information about the
WhereTag see the WhereTag Users Guide.
Also included is a description of the simulator program and how it is used to determine effective
WherePort IV site placement and configuration.
5.2. The WherePort IV
The WherePort IV is a round, dome shaped device, (7.62 inches in diameter and 2.62 inches thick). It is
designed for mounting indoors. It is powered by either 48 VDC POE (Power over Ethernet) or 48 VDC
power adapter. The complete specifications are shown in Table 1. The wiring schematic is shown in
Figure 2.
The WherePort IV is configured using commands sent through the Ethernet POE input or by a separate
RS-232 interface. These commands are described in Appendix B.
Table 1 WherePort IV Specifications
Size 7.62 in. Diameter x 2.62 Depth in. (19.35 x 6.66
cm)
Weight 1.9 lbs (0.83 Kg)
Voltage 48 VDC POE or 48 VDC Input Jack (DC Barrel
Conn)
Current 270 mA max (@48V)
PwrDiss 13.0 Watts (max)
Operating Temperature 0 to +40 ºC
Storage Temperature -40 to +70 ºC
Ingress Protection 33 IP (future Goal NEMA 12)
Humidity 0 to 100% Non-condensing
DC Power Connection RJ45 – POE Connector
DC Barrel Connector– Center contact is (+48V).
Phase Synchronization RJ11 cable from previous WherePort IV (twisted
wire type)
RJ11 cable to following WherePort IV (twisted wire
type)
Configuration Interface RJ45 – Ethernet Connector
RJ11(B Side) – RS232b Serial Connector
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AC/48VDC
Adapter
RJ-45
Power over Ethernet
Sync OutSync In Sync InSync Out
RJ-11 RJ-11
Slave 1Slave 2
Master
RJ-45
POE
Figure 2 Wiring Schematic for Power and Synchronization
Each 48 VDC Adapter supports one WherePort IV.
5.3. Health Tag
A WhereTag that is programmed to blink when there is no signal from the WherePort IV may be
mounted to each WherePort IV. This optional tag is called a health tag because a signal from this tag
indicates that there is something wrong with the WherePort IV that has caused it to stop signaling.
5.4. WherePort IV Mounting
The WherePort IV is mounted using a bracket (Figure 3). It can be mounted onto a wall or ceiling. For
details on installing the WherePort IV see the Installation Instructions.
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Mounting Bracket
Figure 3 WherePort IV Mounting Bracket
6.0 THE WHERETAG
The WhereTag (Figure 4) is pinged by the WherePort IV and responds by transmitting a data message to
the RTLS. The WhereTag is a small device with a magnetic pick up coil and a RF transmitter. It is
mounted to movable assets such as trailers, vehicle assemblies, or storage bins. It transmits a
programmable blink signal. When operating without the WherePort IV, the blink is received by at least
three sensors which enable the system to locate the tag accurately on the site.
The WherePort IV signal is received by a pick up coil in the WhereTag. In the WhereTag III and
WhereTag IV, the coil is oriented along the length of the tag. In WhereTag II it is rotated 30º away from
the length of the tag.
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Coil Orientation
Figure 4 The WhereTag III and WhereTag III ST
The solid line shows the orientation of the pick up coil for both WhereTags.
6.1. WhereTag Responses
The tag can be programmed to respond in a variety ways when it detects a WherePort IV signal. There
are three defined modes (see Figure 5).
Mode 1 The tag enters the field, blinks and then blinks again if it is still in the field after the
retrigger time out.
Mode 2 The tag enter the field, blinks and then does not blink again until it leaves the field and the
retrigger time out expires.
Mode 3 The tag enters the field, blinks and then blinks again after it has left the field and the
retrigger time out expires.
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Figure 5 The WhereTag in a WherePort IV Capture Area
In mode 1, the re-trigger is set for a time interval after the WherePort IV blink. When this interval
elapses, the tag will transmit a blink if the tag is still in the same WherePort IV field. Without the retrigger interval being set, the tag will continue blinking in response to the WherePort IV signal.
If the tag enters a new field, it will transmit a blink, even if the set interval has not elapsed (see Figure 2).
Figure 6 Retrigger Mode 1 and a New Capture Area
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In mode 2 the tag must both leave the WherePort IV field and the specified interval elapse before a
WherePort IV blink will occur. If the tag enters a new WherePort IV field it will immediately transmit a
blink (Figure 2).
Figure 7 Retrigger Mode 2 and a New Capture Area
In mode 3, the set interval must elapse and the tag leave the field, and then the tag will transmit a blink to
indicate that it has left the field. If the tag enters a new field, the tag transmits a blink when it enters the
field. If the re-trigger time out is reached before a new field is entered a blink is transmitted which
indicates the tag is out of the field.
Figure 8 Retrigger Mode 3 and a New Capture Area
6.2. Using the WherePort IV ID
The tag response can also be changed by the WherePort IV. Ports with ids from 0 to 255 are used only
when the alternate blink mode is required. These reserved ids are split evenly between IDs (128 – 255) to
mark the entrance of tag into the field and ids (0 - 127) to mark the exit of a tag from the field. The
significance of other tag IDs is shown in Table 2.
WherePort IVs can turn tags on and off as they enter and leave a site. As an example, WhereTags can be
permanently mounted to trailers. These trailers need to be tracked while they are on the site, but not after
they leave. There is no need for the tag to continue to blink while it is off site. WherePort IVs positioned
at entry and exit gates can turn the tags on when the trailers enter the yard, and off when they leave.
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Table 2 WherePort IV IDs
Tag Response ID Range
Standard WP Response Added Function
0 - 127 Yes Exit Alternate Blink Mode
128 - 255 Yes Enter Alternate Blink Mode
256 - 32,767 Yes
32,768 - 65,534 Yes (ID - 32,768 reported)
65,535 Yes + Response is data register
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7.0 MAGNETIC COMMUNICATION BASICS
The WherePort IV signal is carried by a magnetic field. The field’s shape and size is determined by the
orientation of the coil and the power level. It is not possible to aim the field. One of the characteristics of
a magnetic field is that it drops off rapidly. This produces a well-defined, localized field. These
characteristics make the WherePort IV an excellent device for monitoring tagged assets
7.1. Magnetic Fields
The magnetic field of the WherePort IV extends nearly equally in all directions creating an elliptical field
(Figure 9). The field has a direction that is determined by the position of the coil that creates it.
WherePort Coil
Field Lines
Figure 9 WherePort IV Field
The field extends in all directions around the WherePort IV. The direction of the field is suggested by
the way the field lines are drawn from the coil.
The field is detected and the signal received by a coil in the WhereTag. The orientation of the WherePort
IV’s coil in relation to the orientation of the tag’s coil affects its ability to detect the signal. The optimum
orientation is when the WherePort IV coil and the WhereTag coil are parallel to each other. The worst
orientation is when the coils are perpendicular to each other. As the coils move from optimum to worst
the ability of the Tag to detect the WherePort IV signal decreases (Figure 10).
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Perpendicular
Parallel Coils
Coils
Figure 10 Orientation
When the coil in the tag and the port are parallel the range is the greatest. When the coils are
perpendicular the range is the shortest.
The relative positions of the two coils, WherePort IV transmitting and WhereTag receiving, determine
the range in which the tag will receive the signal. This range is the coverage area, or guaranteed capture
area (Figure 11). The guaranteed capture area is different for each orientation of the tag and the power
level of the WherePort IV.
Guaranteed
Capture Area
Uncertainty Area
Tag Orientation 2
Figure 11 Capture Area
The capture area is shown by the dark shaded area. This shape varies with the orientation of the
tag and the power level of the WherePort IV. The lightly shaded area is the uncertainty area.
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7.2. Coverage Areas
The size of the coverage area is significant as well as its location or placement. It is important that the tag
be released from a field when it is no longer in the area being monitored by the WherePort IV.
There are three areas that are described for the field.
Guaranteed Capture All WhereTags at a given orientation will always be pinged in this area.
Uncertainty A WhereTag may or may not be pinged in this area.
Guaranteed Release A WhereTag will never be pinged beyond this range.
Since a tag may or may not be pinged in the uncertainty area, this area presents the most challenge for a
planner. If a single WherePort IV is installed, a tag that needs to be pinged may not be and a tag that
needs to be released may not be. These coverage areas must be well understood to be able to set up a site.
In the examples that follow these principles will be translated into real applications.
A WhereTag moving through a WherePort IV field will typically change its orientation with respect to
the WherePort IV. As the orientation changes the effective range of the WherePort IV will change.
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Figure 12 Orientation and Capture Area
Two maps are shown for two different WherePort IV mountings, horizontal (left) and vertical (right).
The two maps show two different tag orientations for each of the mountings.
Figure 12 shows the effects of WherePort IV and Tag orientation on the guaranteed capture area. These
maps are taken from the Simulation software.
7.3. Power Level
The size of the field is determined by the power setting for the WherePort IV. There are 31 power levels
for the WherePort IV. Setting the power level to 0 turns off the WherePort IV magnetic field. Table 3
shows the approximate capture and release ranges for each of the power levels when the tag’s orientation
is random and when it is fixed as it moves through the field.
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